From: jfaure@sztele.com
Date: Sat Nov 29 2003 - 14:55:00 GMT-3
Hi all:
-From the 6500 CCO configuration guide, about removing vlan1 from the
trunk:
"You can remove VLAN 1. If you remove VLAN 1 from a trunk, the trunk
interface continues to send and receive management traffic, for example,
Cisco Discovery Protocol (CDP), VLAN Trunking Protocol (VTP), Port
Aggregation Protocol (PAgP), and DTP in VLAN 1. "
-But also, in the same document:
"Disabling spanning tree on the native VLAN of an 802.1Q trunk without
disabling spanning tree on every VLAN in the network can cause spanning
tree loops. We recommend that you leave spanning tree enabled on the native
VLAN of an 802.1Q trunk. If this is not possible, disable spanning tree on
every VLAN in the network. Make sure your network is free of physical loops
before disabling spanning tree"
And then my question is:
If you have several dot1q trunks configured in your swiched network in such
a way that these trunks don't allow pass the vlan1, the vlan1 is the native
vlan for them (you can see this doing a "sh int trunk") and the interface
vlan 1 is in shutdown state in all the switches (but no STP disabled on
this vlan 1), can you have any stp issues like to be unable to block some
loops?
What happens with the STP control traffic if vlan 1 isn't included on the
trunks? Having vlan 1 in shutdown state maybe interpreted by the system as
it has stp disabled for this vlan? I'm usign RAPID PVSTP
Any thoughs will be greatly apreciated.
Juan Faure Ferrer
email: jfaure@sztele.com
Lmnea de Negocio de Telematica y CC
Ingeniero de Integracisn de Redes y Sistemas
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